<title>Neuronet algorithms of data processing in the laser interferometer circuit when detecting low oscillations and vibrations of the object</title>

Abstract

A neuronet algorithm of interferometer data processing has been developed aiming at detection of microoscillations of the object. Analysis of the algorithm parameters has been carried out and sensitivity of the technique has been evaluated on the basis of the nature experiment and simulation data.Keywords: laser interferometer, neuronet algorithm 1.INTRODUCTIONNowadays studies on detecting and estimating modest dynamical changes of the object surfaces are becoming essential and, in particular, when solving tasks of recoding signals of acoustic emission. Acoustic emission technique is based on the analysis of the signal accompanying originating and evolving of flaws of the object of study under different kinds of action -mechanical, thermal, electrical. Today this is the most efficient technique of non-destructive control, which allows one to reveal anomaly at the early stage of their originating when checking the condition of reservoirs, pressure pipes, pipelines, bridges and the other engineering constructions 1,2 . The main difficulties appearing at solution the given problems are connected with need of the registrations of the fluctuations on surfaces having supersmall amplitude in sound and ultrasound range of frequencies. The applicable instrumental methods of the checking are founded on contact measurements of electric signals of tensometric and piezoacoustic sensors 3 . For remote analysis of the dynamic change of the object surfaces it is reasonable to use the method of laser interferometry 4,5 . However regardless clearness and evident simplicity of the method of laser interferometry there exists the number of the factors, limiting the sphere of its usage. These restrictions are connected with absence of the possibilities of registrations and digital processing of the greater arrays of data given in the similar systems until recently, but implie carrying out real-time analysis. The solution of the problem was offered with use of technologies of the direct optical calculations by many researchers 6 . However, with sufficient efficiency of given problem has not been solved yet. At the same time, modern computing facilities and means of the digitally registered images formation on the of base high-speed multipixel CCD-matrixes potentially allow to overcome the mentioned restrictions and realize the efficient algorithms of the processing interferometric data without use of complex technology optical calculations. In order of the realization of the similar processing it is also necessary to note the following. The familiar methods of registration and analysis of the vibration of objects 4,5 require constructing the models of the observed interference picture, exact knowledge of different parameters of the experimental setup and special conditions of the carrying out the observations. Use of the statistical algorithm of detection-estimation of microoscillations of the object due to the data processing laser interferometry, even under condition of the use of the modern facilities to registration and computer pr...